Add 54/80 and 28/90
54/80 + 28/90 is 71/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
54/80 = 54 × 9/80 × 9 = 486/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
28/90 = 28 × 8/90 × 8 = 224/720 - Add the two like fractions:
486/720 + 224/720 = 486 + 224/720 = 710/720 - 710/720 simplified gives 71/72
- So, 54/80 + 28/90 = 71/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/80+56/90 54/80+84/90